Add time:07/27/2019         Source:sciencedirect.com

The enthalpies of combustion of ethylcyclobutane, methylenecyclobutane, and,1-dimethylcyclopropane were measured by oxygen-bomb combustion calorimetry. The following values are reported for the standard enthalpy of combustion ΔHoo(298.15 K)/kcalth mol−1, † of these compounds in the liquid state: ethylcyclobutane, −(960.11 ± 0.16); methylenecyclobutane, −(765.95 ± 0.12); 1,1-dimethylcyclopropane, −(803.86 ± 0.17). The enthalpy of vaporization of methylenecyclobutane was derived from vapor pressure measurements, and enthalpies of vaporization of ethylcyclobutane and 1,1-dimethylcyclopropane were estimated. Values of the enthalpy of formation in the liquid and gaseous states were derived for all three compounds. Ring-strain energy was estimated. Some regularities and irregularities in the accepted values of enthalpies of combusion of the alkylcyclopropanes and alkylcyclobutanes indicate an error in a previous determination of the enthalpy of formation of methylcyclobutane.

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